The retired fighter offered no details about his brother’s death, and MMAjunkie was unable to reach him for comment. Monday on Twitter, Kenny Florian asked anyone with information about his brother’s whereabouts to call the Dover Police Department in Delaware. He said his brother had been missing since Saturday. He later deleted the message.

A police officer with the Dover Police Department told MMAjunkie he was familiar with Kirk Florian, but wasn’t sure what information the police were giving out and referred questions to a spokesperson.

The Association of Boxing Commission’s database shows Kirk Florian fought as an MMA amateur on three occasions, representing the Florian Martial Arts Center his brothers ran in Brookline, Mass. He went 3-0 and most recently earned a split-decision win over Dominic Cofone in 2013 for the promotion Combat Zone, where Kenny Florian was discovered by UFC President Dana White for “The Ultimate Fighter 1.”

MMAjunkie will update this story as more information becomes available.